Add mediaPlayer.addTextTrack()
#3573
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This method allows for loading captions from a file not listed in the manifest.
Needed for MediaPlayer.addTextTrack()
malthejorgensen
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src/streaming/CaptionsLoader.js
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| if (data.indexOf('WEBVTT') > -1) { | ||
| return VTTParser(context).getInstance(); | ||
| } | ||
| // } else if (data.indexOf('MPD') > -1 || data.indexOf('Patch') > -1) { |
src/streaming/MediaPlayer.js
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| captionsLoader.reset(); | ||
| }; | ||
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| eventBus.on(Events.EXTERNAL_CAPTIONS_LOADED, handler, self); |
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Can this event be captured by the TextSourceBuffer instead and cause createTextTrackFromMediaInfo() to be called? Instead of duplicating the code?
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You are totally right, I think the current structure is an artifact of how I wrote the change initially.
Change done in 39773bb
| } | ||
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| /********* END ***********/ | ||
| let captionsLoader = createCaptionsLoader(); |
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Do we need to create a new instance of CaptionsLoader every time? Might consider creating a single instance as part of TextController and then call textController.getCaptionsLoader
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I think you're right, but I'm not sure how to do it. Currently the CaptionsLoader inherits requestModifier and mssHandler from the MediaPlayer config. Those don't seem available from inside TextController, so I'm not sure how pass those along if it's created in TextController.setup().
Move `EXTERNAL_CAPTIONS_LOADED`-event listener into TextSourceBuffer and to allow reusing `createTextTrackFromMediaInfo`. This requires passing `mediaInfo` to CaptionsLoader and adding the passed MediaInfo to `TextSourceBuffer.mediaInfos`. Also removes `TextTracks.getNumberOfTextTracks()` which is no longer needed.
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@malthejorgensen Sorry for the delay on my end. We are currently working on version 4.0 including major changes to the general structure of dash.js. Once this is done I will get back to your PR |
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Will this be merged? This is really useful when the backend doesn't support adding tracks in the manifest. :) |
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2 years later.. any update on this? I'm now creating a HTMLTrack element as workaround. Thanks. |
This is a proof-of-concept for allowing adding captions/subtitles that are not listed in the manifest.
See issue: #3572